Effects of sintering temperature on the superconducting and microstructural properties of Bi1.7Pb0.4Sr1.6Ca2.4Cu3.6OY/Ag2O composites
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The effects of sintering temperature on the superconducting and microstructure properties of Bi1.7Pb0.4Sr1.6Ca2.4Cu3.6OY (BPSCCO)/Ag2O (0–50 wt%) superconductors were investigated. Based on the differential thermal analysis data, it was found that the addition of Ag2O to the BPSCCO system lowered the partial melting temperature (peritectic point), thereby promoting extra liquid formation in this system and affecting the stability of 2223 high-Tc phase of these composites. For example, the Tc (zero) of the BPSCCO/Ag2O (10 wt%) composite which was sintered at 843 °C in air was depressed by as much as 52 K. However, the addition of Ag2O (10–50 wt%) in the BPSCCO samples resulted in no significant effect on Tc when samples were treated under a lower sintering temperature (827 °C) in air. The correlations of superconducting properties with microstructures of these materials are discussed.
KeywordsPolymer Microstructure Analysis Data Thermal Analysis Melting Temperature
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- 18.Y. D. Chiu, C. H. Kao, Y. S. Shiue, S. R. Sheen, T. S. Lei and M. K. Wu, in “Proceedings of Symposium on Beijing International Conference on High Tc Superconductivity”, 25 May 1992, Beijing, China, in press.Google Scholar